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295bf6b73b
Freed file data extents are tracked in free extent items in each node. They could only be re-used in the future for file data extent allocation on that node. Allocations on other nodes or, critically, segment allocation on the server could never see those free extents. With the right allocation patterns, particularly allocating on node X and freeing on node Y, all the free extents can build up on a node and starve other allocations. This adds a simple high water mark after which nodes start returning free extents to the server. From there they can satisfy segment allocations or be sent to other nodes for file data extent allocation. Signed-off-by: Zach Brown <zab@versity.com>